A nine-mile-wide meteorite strikes Mexico's east coast, covering much of Earth with rocks, fire and toxic gases. The theory today is that dinosaurs and most other species were extinguished and that burrowing mammals—our ancestors—survived. The Chicxulub Crater remains to this day.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.